Seems like "full disclosure" is a perfectly good way to say what they were trying to say. Your version is ok too, but does not have the same implication of "I have a particular bias here, so I am disclosing that so that you read my comment through that lens".

Yes that's fine, disclosure is usually the word 'offenders' are looking for, for sure.

I just thought that here the tone was more 'here's why I can give you a good answer' than 'I'm aware my answer may be biased'.

Basically, the three things that are conflated into 'disclosure' are (all 'for example'):

1. (Disclosure) I have a vested interest in this because I work at the company being discussed [but I really think everything's fine and this isn't an issue];

2. (Actual disclaimer) I left the companh being discussed years ago so I have no knowledge of this issue [but my opinion is..];

3. (Source/background/listen to me!) I work at the company being discussed [so I'll pass on your feedback]

For me this is more a 3 than a 1, because there's no 'but' I suppose is the simple way to put it. You disclose a relationship because it might put what you're saying in a different (worse) light; here it's just why it's worth listening to. (If they'd said 'Company X is the best for negotiating salary IMO', 'I am CTO there though' would be a good disclosure!)

No worries, valid point. I have ESL (English as Second Language) but noted.

Ah, then no hard feelings I hope; you just picked it up from so many others getting it wrong! It is a common error for sure, just a pet peeve of mine for some reason, so I call it out occasionally.